e metal refining, forging, design, fabrication, and maintenance 。The difficulty of Dou Kai is at least ten times higher than that of mecha. 。If you have money, you can find the best people to design a...in feel much better. If it were a soul guiding device, he'd be in trouble. At the very least, he'd have to find a way to continue downwards, bypassing this metal wall. 。But if it's just a simple metal...